Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Potentially Dilutive Securities Excluded from Calculation of Diluted Net Loss per Share Due to Anti-Dilutive Effect

For the six months ended June 30, 2016 and 2015, the following potentially dilutive securities were excluded from the calculation of diluted net loss per share due to their anti-dilutive effect:

	Six Months Ended June 30,
	2016		2015
Options to purchase common stock, including purchases from contributions to ESPP		9,352,432		7,954,304
Restricted stock units		347,111		58,975
Warrants to purchase common stock		150,000		150,000
		9,849,543		8,163,279